Stores find success by focusing on the hunt

Trader Joe's, the specialty grocery chain, might not have the cheapest toilet paper or the most varieties of ketchup, but it hooks customers with mango butter, chocolate-covered pomegranate seeds and cilantro-and-jalapeno hummus.
These goodies aren't on most grocery lists, but they're eye-catching enough to tempt shoppers into an impulse buy. At a time when families are ...